title: The Mn-binding proteins of the photosystem II oxygen-evolving complex are decreased in date palms affected by brittle leaf disease.
abstract: Brittle leaf disease or maladie des feuilles cassantes (MFC) is a disorder affecting date palms (Phoenix dactylifera L.) which after a long declining process eventually leads to the death of the plant. No causal agent for the disease has been found so far but leaflets of affected palms are Mn-deficient despite the existence of adequate exchangeable Mn in the soils in which affected palms grow. The disease is specifically associated with an increase in a series of chloroplastic RNAs. A proteomic analysis of leaflets of affected and unaffected date palms showed differences in quantities of several proteins. Mn-binding PSBO and PSBP proteins, components of the oxygen-evolving complex of photosystem II, were decreased in affected tissue, reinforcing the relation between MFC and Mn deficiency. The quantities of other proteins were increased by disease suggesting a response to stress.
authors.affiliation: Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia), Valencia, Spain.
authors.forename: Jorge
authors.initials: J
authors.lastname: Marqués
authors.forename: Nuria
authors.initials: N
authors.lastname: Duran-Vila
authors.forename: José-Antonio
authors.initials: JA
authors.lastname: Daròs
mesh_terms: D000222:Adaptation, Physiological; D028023:Arecaceae / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000378:metabolism; D002736:Chloroplasts / Q000235:genetics / Q000378:metabolism*; D008345:Manganese / Q000378:metabolism*; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D010935:Plant Diseases / Q000209:etiology*; D018515:Plant Leaves / Q000378:metabolism*; D010940:Plant Proteins / Q000378:metabolism*; D020543:Proteome / Q000032:analysis; D040901:Proteomics; D012313:RNA / Q000378:metabolism; D012987:Soil; D013312:Stress, Physiological
chemical_list: D002352:Carrier Proteins; D045332:Photosystem II Protein Complex; D010940:Plant Proteins; D020543:Proteome; D012987:Soil; C052389:oxygen-evolving enhancer protein 1, plant; D008345:Manganese; D012313:RNA